/**
 * 字符串索引
 * 
 * 报错的情况
 * const obj = {a:1,b:2}
 * Object.keys(obj).forEach(key => obj[key])
 * 
 * 
 * 解决报错情况
 * const obj:StringIndex = {a:1,b:2}
 * Object.keys(obj).forEach(key => obj[key])
 */
export interface StringIndex<T> {
  [index: string]: T
}
